Improvement in flouring-mills



U. AB O MAN.- j -3 sneets-sheet 1.

P10111 Y Mill;

' No. 103,003. Patented May-10, 1870i N. PETERS, PHOTO-LITNGGRAPHER. WASHINGTON. D4 c.

. 4 3 Sheets-8106602. U. B0 W 1v1 A N. l

P10041*n M111. 010,103,003. PatentedMay 10,1870.

NJLTERS, PHOTO-IJTMDDRAPMER. WASHINGTON. D. C.

` @sheets-Sheen 3 U. BOWL/IAN.

Flour Mill.

10.103 003'. Y -BatentedMay 1o, 1870.

y' .nvcnv/n 7- Wwfm j @MM www lwheel may be secured by a suitable shifting device, to

pnt it into and ont of gear.

The suspension beam H 'of the upper stone is pivoted at one end and connected at the other to a vertical rod, S, which Amay be adjusted by means of a screw or the levers T U V, as shown in gs. 1 and 3,

to produce any desired pressure of the upper upon the lower burr, and thus compensate for their comparatively light weight. c

A blast-fan is inolosedA within the ease W, and a spout, W2, leads therefrom into the case X, which surroundsthe bnrrs, for introducing a continuons blast of cold air directly-around the bnrrs, to keep them vcool and prevent the Hour from becoming too highly heated. The blast from the fan may be so directed as to strike the opening through which the grain is fed' to the 'bnrrs and blow out thc `chafi` and dust.

The grain-hopper Y is supported upon the upper bridge-tree I, and is provided with the usual shaking trough Z for feeding the` grain througlrra spout in the bridge-tree into the eye ot' the upper burr.

The our is discharged through a spont,.j, from the burr-case into a chest, k, or bag, as may be desired.

As' the mill is designed especially as' a portable one, the hopper, therefore, requires to be supplied from time to time, bnt,'in case it should become empty at any time, from neglect or other cause, I hang a bell, l, within it, so as to be 'vibrated, and thus give an alarm vwhen the grain in the hopper has fallen below the bell, but so long as the bell is imbedded in the grain it will not ring. This signal-alarm is operated bythe driving mechanism, arranged in any convenient manner, but in the drawings it is represented as being operated by devices when the mill is arranged to be driven by hand-power, as shown in fig. 2, and by water-power, as shown in fig. These devices consist of a spring arm, m, connected to the handle p of the bell by a cord, yn, andai-ranged so as to be struck by cams o, on the face of the coggcd wheel P, and, although the cams will vibrate the bell cach revolution of the wheel, yet no alarm will be given until the grain in the hopper is nearly fed ont, so as to set the' bell free to make the alarm.

In fig. 3 the devices for operating the alarm are shown as arranged when the mill is driven by waterpower, in which case the spring arm m is actuated by cams q on the circumference ot' the cogged wheel P, and the handle of the bell is connected by another cord, fr, to a trip-lever, s, which is tripped when the' bell has free motion, and which in turn trips a weighted arm, t, which, through a-connecting-rod, u, operates a rock-shaft, o, and lets fall a gate, w, to close the millrace and cut oli` the water to the wheel, .as shown in figs. l2 and'13. But these devices may be arranged.

in various ways, and, therefore, any special devices need not be particularly described.

When the mill is arranged to be driven by waterp'ower, the water-whecl'is secured upon the lower end of the shaft ot' the driving-wheel I.

Having thus described my improvement,

I claim- 1'. The lower burr C, adjusted upon'the spindle E, which carries it, and the upper burr B, suspended by its driving-spindle D, in combination with the master cog-wheel K and the gearing L L', for communicating to said bnrrs their opposite motions, as herein shown and described.

2. The combination of the adjustable beam H with the short driving-spindle D ot' the upper burr B, and

the metallic frame J, by which said short spindle is suspended, arranged, and operating, asherein shown and described.

3. The combination of the short spindles D a-nd E with the anti-friction wheels a, the graduating wedges c and their carrying arms b, all arranged and constructed substantially as -herein shown and described.

4. The combination of the bell l with 'the cordl n., the tripping-lever m, andthe cams o, upon the' driving gear-wheel P, all arranged and operating substantially as herein described.

5 'lhe arrangement of the tripping devices S T U Y, connected to and operated by the vibration of the handle of tbe bell, to automatically trip and let fall the water-gate w, to shut od' the water from the wheel when the mill is operated by water-power, as herein shown and described.'

URIAH BOWMAN.

'itnesses:

Daman W. Barns, GEORGE' MAYNARD. 

